Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
danh dum » danh du, anh duc, danh tu
sach ty » sach y, sach tu, sach thu
dum cua » duy cua, dam cua, dung cua
luc van » luoc van, luu van, duc van
xuc van » duc van, vuc van, xuc ban
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu van
ty nang » ky nang, ty xang, ty hang
hieu va » lieu va, hieu qua
ma hoi » mai hoi, xa hoi, ma hoa

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ma hoi. ((hieu ve) OR (hieu va)) cam ((xuc van) OR (luc van)) danh dum cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang ma hoi. ((hieu ve) OR (hieu va)) cam ((xuc van) or (luc van)) danh dum cua triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ma hoi. ((hieu ve) OR (hieu va)) cam ((xuc van) or (luc van)) danh dum cua triet*.